JP3753320B2 - Shield material manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a shield material in which a soft magnetic quenched alloy ribbon obtained by heat treatment of an amorphous material is attached to a resin film on the outer periphery of an adhesive roll.
[0002]
[Prior art]
Amorphous materials and nanocrystalline materials are known as magnetic ribbons having excellent magnetic properties. A typical amorphous material can be obtained as a ribbon having a thickness of 50 μm or less by rapidly cooling the molten metal on the roll surface. Although it may be used as it is, it is often subjected to heat treatment to improve magnetic properties.
In addition, the nanocrystalline material is prepared by rapidly cooling a molten metal having an alloy composition that can be adjusted to a nanocrystalline structure, such as Fe-Cu-Nb- (Si, B), in the same manner as the above amorphous alloy. Then, it can be obtained by adjusting to a nanocrystalline structure by heat treatment. The nanocrystalline material is a material in which at least 50% of the structure is composed of fine crystal grains having an average crystal grain size of 100 nm or less, as shown in, for example, Japanese Patent Publication No. 4-4393.
[0003]
The soft magnetic quenched alloy ribbon of amorphous material or nanocrystalline material subjected to the heat treatment described above tends to be brittle due to reduced toughness compared to the amorphous material that has been quenched. In particular, when crystallized by heat treatment and adjusted to a nanocrystalline structure, the tendency to embrittle is remarkable, and there is a problem that the ribbon is easily broken during handling.
Applications of the amorphous material or nanocrystalline material include, for example, a sensor material described in Japanese Patent Publication No. 5-19196 and a shielding material described in Japanese Patent Application Laid-Open No. 1-241200. In such applications, the use of brittle strips causes problems such as cracking, chipping, etc. during handling and use, so usually one side or both sides of soft magnetic quenched alloy strips. In many cases, a laminated ribbon is used as a composite by pasting resin.
[0004]
When a soft magnetic quenching alloy ribbon and a resin are combined to form the above-described laminated ribbon, the resin generally has a high heat resistance of only about 300 ° C., for example, the heat treatment of the nanocrystalline material described above. When a temperature exceeding 400 ° C. is applied, the resin cannot be attached or coated in advance before the heat treatment, and therefore, a composite thin film is formed after the heat treatment.
Conventionally, a composite of a soft magnetic quenched alloy ribbon and a resin after heat treatment is manufactured by bonding the magnetic ribbon and the resin using two adhesive rolls as shown in FIGS. Yes. In addition, as shown in FIG. 6, a manufacturing method in which a roller or the like is pressed directly on a magnetic ribbon coil to attach a resin has been studied (see Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-51933
[Problems to be solved by the invention]
In the conventional method shown in FIG. 4 and FIG. 5, since the unconstrained magnetic ribbon 4 from the magnetic ribbon coil 7 until it comes into contact with the adhesive roll 2 is long, it has a shape like an amorphous material or a nanocrystalline material. In the case of handling a heterogeneous brittle material, the soft magnetic quenched alloy ribbon may be broken at the stage of setting in the apparatus.
Further, even after the start of production, the unconstrained magnetic ribbon 4 may be twisted or meandered as shown in FIG.
[0007]
On the other hand, the device disclosed in Patent Document 1 does not have a portion corresponding to the unconstrained magnetic ribbon, and thus the above-described twisting and meandering are unlikely to occur. However, since the resin film is affixed by pressing the pressing roll 9 or the like on the magnetic ribbon coil, stress is always applied to the contact point. In addition, since the magnetic ribbon coil is not a perfect circle, an impact may be applied to the magnetic ribbon coil at the time of contact, and it may break.
An object of the present invention is to provide a method for producing a shield material that can be stably stuck to a resin film without breaking a soft magnetic quenched alloy ribbon that has become embrittled by heat treatment.
[0008]
[Means for Solving the Problems]
The present inventor examined the problem that the magnetic ribbon unwound from the coil wound with the soft magnetic quenched alloy ribbon was broken by twisting or meandering, and the soft magnetic quenched alloy ribbon was unwound from the coil. It has been found that twisting and meandering can be greatly improved by adopting a configuration in which the length of the unconstrained magnetic ribbon until contact with the adhesive roll and the tension of the magnetic ribbon are strictly controlled.
[0009]
That is, the present invention is a method for producing a shield material in which a soft magnetic quenched alloy ribbon is continuously unwound from a coil wound with the soft magnetic quenched alloy ribbon and adhered to a resin film on the outer periphery of an adhesive roll. The length L of the unconstrained magnetic ribbon until the soft magnetic quenched alloy ribbon is unwound from the coil and contacts the adhesive roll is set to 0 <L ≦ 200 (mm), and 3.3 per unit cross-sectional area. is 0 × ¹⁰ 6 ~8.0 × ¹⁰ 6 manufacturing method of the soft magnetic thin-strip rapidly solidified alloy unwinding the shielding member while applying tension (Pa).
The present invention is particularly suitable when using a nanocrystalline alloy ribbon in which at least 50% of the structure is composed of a nanocrystalline structure having an average crystal grain size of 100 nm or less.
Further, it is preferable to use a pressure-bonding roll and pressure-bond the soft magnetic quenched alloy ribbon and the resin film at a position on the adhesive roll different from the position where the soft magnetic quenched alloy ribbon starts to contact the adhesive roll.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As described above, an important feature in the method for producing the laminated ribbon of the present invention is that the length L of the unconstrained magnetic ribbon until the soft magnetic quenched alloy ribbon is unwound from the coil and contacts the adhesive roll. 0 <L ≦ 200 (mm), and a tension of 3.0 × 10 ^{6 to} 8.0 × 10 ⁶ (Pa) is applied to the soft magnetic quenched alloy ribbon wound from the magnetic ribbon coil It is.
[0011]
The production method of the present invention can be carried out by the apparatus shown in FIGS. 1 and 2, for example. FIG. 1 shows that a resin film 6 with an adhesive on one side is unwound from a resin film unwinding machine 1, and a magnetic ribbon is unwound from a magnetic ribbon coil 7 installed in a magnetic ribbon unwinding machine 3. FIG. 3 is a schematic configuration diagram of an apparatus for manufacturing a laminated ribbon (shield material) in which the laminated ribbon 9 is wound by a winder 5 after being joined on the outer periphery of the adhesive roll 2 to form a laminated ribbon 9. FIG. 2 is an enlarged schematic view of only the magnetic ribbon unwinding machine 3, the adhesive roll 2 and the pressure roll 8 of FIG.
In the manufacturing method of the present invention, the distance L between the unwinding start position 12 of the soft magnetic quenched alloy ribbon on the outer peripheral surface of the magnetic ribbon coil 7 and the contact start position 10 on the outer periphery of the adhesive roll, that is, when the laminated ribbon is manufactured. The magnetic ribbon unwinding machine 3 and the adhesive roll 2 are arranged so that the length L of the unconstrained magnetic ribbon is 0 <L ≦ 200 mm. In addition, a tension of 3.0 × 10 ^{6 to} 8.0 × 10 ⁶ (Pa) is applied to the soft magnetic quenched alloy ribbon in the unconstrained magnetic ribbon portion.
[0012]
According to the inventor's study, in most cases, the breakage of the soft magnetic quenched alloy ribbon at the time of manufacturing the shield material is the unwinding start position of the unconstrained magnetic ribbon and the magnetic ribbon coil or bonding with the unconstrained magnetic ribbon. Occurs at the contact start position with the roll. This is because the amorphous magnetic material and the soft magnetic quenched alloy ribbon, which is a nanocrystalline material, are significantly more brittle than a general crystalline metal material. This is considered to be due to the stress concentration caused at the contact start position. Therefore, in order to reduce the breakage of the soft magnetic quenched alloy ribbon, it is important to reduce the twist and meander of the unconstrained magnetic ribbon. In the present invention, by controlling the length and tension of the unconstrained magnetic ribbon within a specific range, twisting and meandering of the unconstrained magnetic ribbon are reduced, and breakage of the soft magnetic quenched alloy is suppressed.
[0013]
First, in the apparatus shown in FIG. 4, the present inventor examined the causes of twisting and meandering generated in the unconstrained magnetic ribbon when the soft magnetic quenched alloy ribbon was unwound from the coil. As a result, it has been found that the occurrence of twisting and meandering is partly because the thickness of the soft magnetic quenched alloy ribbon is not constant in the width direction.
The soft magnetic quenched alloy ribbon tends to cause uneven thickness due to the method of quenching the molten metal on the roll surface, and it is difficult to strictly control the thickness in the width direction. According to the study of the present inventor, the thickness variation of the soft magnetic quenched alloy ribbon is often 10% or more of the magnetic ribbon thickness.
[0014]
In the soft magnetic quenched alloy ribbon in which one side in the width direction is thick, when the unconstrained magnetic ribbon comes into contact with the adhesive roll on the entire surface in the width direction, the unconstrained magnetic ribbon is twisted. When the soft magnetic quenching alloy ribbon is continuously unwound, the unconstrained magnetic ribbon is repeatedly twisted. At this time, if the tension applied to the unconstrained magnetic ribbon is not sufficient, the twist becomes large. As a result, it is considered that the soft magnetic quenched alloy ribbon is ruptured. In some cases, meandering may also occur during this process.
[0015]
Therefore, in the present invention, by applying a tension of 3.0 × 10 ^{6 to} 8.0 × 10 ⁶ (Pa) per unit cross-sectional area to the unconstrained magnetic ribbon, the thickness of the soft magnetic quenched alloy ribbon can be varied. Suppresses twisting and meandering. In a state where a certain tension or more is applied, a portion having a large thickness in the width direction of the unconstrained magnetic ribbon mainly comes into contact with the adhesive roll at a contact start position, and a portion having a small thickness comes into contact with the adhesive roll in a floating manner. Since the state is maintained, it is possible to suppress the occurrence of a large twist that causes breakage. According to the study of the present inventor, when a tension of 3.0 × 10 ⁶ Pa or more is applied to the unconstrained magnetic ribbon wound from the magnetic ribbon coil, the unconstrained magnetic ribbon is restrained from torsional amplification. I can do it. Preferably, a tension of 4.0 × 10 ⁶ (Pa) or more is applied.
On the other hand, if the tension is too high, the applied tension itself may cause the soft magnetic quenched alloy ribbon to break. Therefore, in the present invention, the tension applied to the unconstrained magnetic ribbon is set to 8.0 × 10 ⁶ (Pa) or less. Preferably, a tension of 6.0 × 10 ⁶ (Pa) or less is applied.
[0016]
Simultaneously with the tension control described above, in the present invention, the length L of the unconstrained magnetic ribbon until it comes into contact with the adhesive roll is set to 0 <L ≦ 200 (mm).
The longer the unconstrained magnetic ribbon is, the higher tension is required to suppress torsional amplification. On the other hand, when the tension is too high, the tension itself applied as described above causes the ribbon to break. According to the study by the present inventors, if L ≦ 200 (mm), the amplification of torsion can be suppressed by a tension of 8.0 × 10 ⁶ (Pa) or less. Preferably, L ≦ 100 (mm).
[0017]
In addition, L> 0 mm, that is, making the magnetic ribbon coil and the outer peripheral surface of the adhesive roll non-contact is that the compressive stress generated by pressing the contact roll 2 against the magnetic ribbon coil 7 is broken when contacted. It is a cause.
Furthermore, by making non-contact, the magnetic ribbon unwound from the magnetic ribbon coil has a degree of freedom in the movement in the direction perpendicular to the running direction of the resin film. Even when they are not exactly orthogonal, it is possible to correct the spontaneous displacement, and even if the lamination is continued after the occurrence of the displacement, it is difficult to cause breakage.
[0018]
The method of the present invention is particularly effective in producing a laminated ribbon using a nanocrystalline material in which at least 50% of the structure has a nanocrystalline structure with an average crystal grain size of 100 nm or less. Nanocrystalline materials are significantly more brittle than ordinary amorphous materials after heat treatment of amorphous ribbons. As described above, according to the manufacturing method of the present invention, stress concentration is hardly generated in the unconstrained magnetic ribbon, so that even when a nanocrystalline material that is fragile and breaks easily is used, it is difficult to break during manufacturing.
[0019]
Furthermore, in the manufacturing method of the shielding material of the present invention, when the soft magnetic quenched alloy ribbon and the resin film are combined, the pressure-sensitive roll is used to press the soft magnetic quenched alloy ribbon and the resin film on the adhesive roll. In this case, according to the study of the present inventor, the crimping position 11 for pressing the crimping roll 8 on the adhesive roll 2 as shown in FIGS. Is preferably set to a position different from the position where the soft magnetic quenched alloy ribbon starts to contact the adhesive roll (contact start position 10 in FIGS. 1 and 2).
[0020]
As already described, the soft magnetic quenched alloy ribbon in which the thickness varies in the width direction, the soft magnetic quenched alloy ribbon starts contact with the adhesive roll (for example, the contact start position 10 in FIG. 2). The soft magnetic quenched alloy ribbon, which is an unconstrained magnetic ribbon, is repeatedly twisted, and the soft magnetic quenched alloy ribbon at the position where contact starts is still in a dynamic state. When a soft magnetic quenching alloy ribbon in a dynamic state is pressed, the stress generated in the soft magnetic quenching alloy ribbon is not constant at the part that first contacts the pressure roll. Therefore, pressurization in a dynamic state may cause excessive stress in the soft magnetic quenched alloy ribbon, and in that case, pressurization of the pressure roll causes the soft magnetic quenched alloy ribbon to break. .
[0021]
The soft magnetic quenched alloy ribbon is in a dynamic state only in the very vicinity of the position where contact starts, and at other positions, the position of the soft magnetic quenched alloy ribbon is fixed on the resin film. Therefore, the breakage of the soft magnetic quenched alloy ribbon can be reduced by pressing at a position different from the position where the soft magnetic quenched alloy ribbon starts to contact the adhesive roll.
Therefore, in the manufacturing method of the shield material of the present invention, the soft magnetic quenched alloy ribbon and the resin film are positioned at a position different from the position where the soft magnetic quenched alloy ribbon is unwound from the coil and starts to contact the adhesive roll. Is preferably crimped.
[0022]
Furthermore, in the manufacturing method of the shielding material of the present invention, a wide laminated ribbon can be manufactured by arranging a plurality of magnetic ribbon coils 7 in the width direction as shown in FIG. In the apparatus of the present invention, it is possible to appropriately arrange a magnetic ribbon coil at an arbitrary position on the adhesive roll 2, and a laminated ribbon exceeding the width of the magnetic ribbon without enlarging the apparatus other than the roll width. Can be manufactured. In FIG. 3, two magnetic ribbon coils 7 are arranged. However, if there is a space on the outer periphery of the adhesive roll, it is possible to arrange three or more magnetic ribbon coils.
[0023]
【The invention's effect】
According to the present invention, it is possible to dramatically improve the breakage of a soft magnetic quenched alloy ribbon when a soft magnetic quenched alloy ribbon embrittled by heat treatment is applied to a resin film. This is an indispensable technique for manufacturing a certain shield material.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a manufacturing apparatus showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a proximity portion between a magnetic ribbon coil and an adhesive roll.
FIG. 3 is a perspective view of a preferred embodiment of the present invention in which a plurality of magnetic ribbon coils are arranged.
FIG. 4 is a schematic configuration diagram of a conventional laminated ribbon manufacturing apparatus.
FIG. 5 is a perspective view showing a stress concentration generation unit in a conventional apparatus.
FIG. 6 is a schematic configuration diagram of a conventional laminated ribbon manufacturing apparatus.
[Explanation of symbols]
1 resin film unwinding machine, 2 adhesive roll, 3 magnetic ribbon unwinding machine, 4 unconstrained magnetic ribbon, 5 winding machine, 6 resin film, 7 magnetic ribbon coil, 8 pressure roll, 9 laminated ribbon, 10 Contact start position, 11 Crimp position, 12 Unwind start position

Claims (3)

A method for producing a shield material, in which a soft magnetic quenching alloy ribbon is continuously unwound from a coil wound with the soft magnetic quenching alloy ribbon and adhered to a resin film on the outer periphery of an adhesive roll, the method comprising: The length L of the unconstrained magnetic ribbon until the alloy ribbon is unwound from the coil and comes into contact with the adhesive roll is set to 0 <L ≦ 200 (mm), and 3.0 × 10 ⁶ per unit cross-sectional area A method for producing a shielding material, comprising unwinding the soft magnetic quenched alloy ribbon while applying a tension of 8.0 × 10 ⁶ (Pa). The method for producing a shielding material according to claim 1, wherein the soft magnetic quenched alloy ribbon is a nanocrystalline alloy ribbon in which at least 50% of the structure is composed of a nanocrystal structure having an average crystal grain size of 100 nm or less. . Claims characterized in that the soft magnetic quenched alloy ribbon and the resin film are crimped using a crimping roll at a position on the adhesive roll different from the position where the soft magnetic quenched alloy ribbon starts to contact the adhesive roll. Item 3. A method for producing a shielding material according to Item 1 or 2.

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